Enhance documentation for Riverscapes Inundation Mapper

Added introductory content and image for the Riverscapes Inundation Mapper Tool.

Author: joewheaton

docs/docs/index.mdx

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 [![RIM_01](/img/RIM_01.png)](https://digitalcommons.usu.edu/etd/8226/)
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 The **Riverscapes Inundation Mapper** Tool, or **RIM**, was developed as part of Karen Bartelt's Thesis ([Bartelt et al. 2021](https://digitalcommons.usu.edu/etd/8226/)) to aid in the efficient mapping of structurally forced inundation patterns in beaver impacted riverscapes. RIM has since been published in Bartelt et al. ([2025](https://doi.org/10.1371/journal.pwat.0000428)) and the RIM mapping procedures and metrics have been incoprorated into various protocols (e.g. [LTPBR V2](https://qris.riverscapes.net/technical-reference/protocols/protocol-library/dce-protocols/ltpbr-dce-protocol/#resources)) inside Riverscapes Sudio - [QRiS](https://qris.riverscapes.net).
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 ![Graphical Abstract](/img/GraphicalAbstract.png)